ISC Class 12 Biology Weightage 2025: Unit and chapter-wise marks distribution
Across all units and chapters, ISC Class 12 Biology Weightage 2025 for the CISCE 2025 board exam theory paper is provided here. Biology exam will be held on March 21.
ISC Class 12 Biology Weightage 2025: Council for the Indian School Certificate Examinations (CISCE) releases the unit and chapter-wise marks distribution for the Class 12 Biology Weightage for the 2025-2026 academic session. Students and educators can now review the unit and chapter-wise weightage to better strategize their studies, focusing on areas with higher marks allocation. The ISC Class 12 Biology 2025 Syllabus focuses on building strong reading, writing, listening, and speaking skills. All the aspirants who have opted for Biology as one of their core subjects can check the detailed and complete ISC Class 12th Biology Weightage 2025 here.
ISC Class 12 Biology Weightage 2025 Chapter-Wise
The total marks distribution for all units and their respective chapters is as follows:
| Unit Name | Chapter Name | Total Weightage without options | Total Weightage with options |
| Unit 1: Reproduction | Sexual reproduction in flowering plants | 6 marks | 9 marks |
| Human Reproduction | 5 marks | 7 marks | |
| Reproductive Health | 5 marks | 7 marks | |
| Total | 16 marks | 23 marks | |
| Unit 2: Genetics and Evolution | Principles of inheritance and variation | 5 marks | 7 marks |
| Molecular basis of Inheritance | 4 marks | 6 marks | |
| Evolution | 6 marks | 9 marks | |
| Total | 15 marks | 22 marks | |
| Unit 3: Biology and Human Welfare | Human Health and Diseases | 8 marks | 11 marks |
| Microbes in Human Welfare | 6 marks | 8 marks | |
| Total | 14 marks | 19 marks | |
| Unit 4: Biotechnology and its Applications | Biotechnology - Principles and processes | 5 marks | 7 marks |
| Biotechnology and its applications | 5 marks | 8 marks | |
| Total | 10 marks | 15 marks | |
| Unit 5: Ecology and Environment | Organisms and Populations | 6 marks | 8 marks |
| Ecosystem | 4 marks | 6 marks | |
| Biodiversity and its Conservation | 5 marks | 7 marks | |
| Total | 15 marks | 21 marks |
ISC Class 12 Biology 2025 Project Work Evaluation Criteria
Check the evaluation criteria for ISC Class 12 Biology, in the table below:
| Assessment Type | Marks |
Project Work
| 10 marks |
Practical File
| 5 marks |
ISC Class 12 Subject-Wise Weightage 2025 |
| Subject | Unit and Chapter-Wise Marks Distribution Links |
| Chemistry | ISC Class 12 Chemistry Weightage 2025 |
| Physics | ISC Class 12 Physics Weightage 2025 |
| Mathematics | ISC Class 12 Mathematics Weightage 2025 |
| Accounts | ISC Class 12 Accounts Weightage 2025 |
| Business Studies | ISC Class 12 Business Studies Weightage 2025 |
| Economics | ISC Class 12 Economics Weightage 2025 |
| English Language | ISC Class 12 English Language Weightage 2025 |
| English Literature | ISC Class 12 English Literature Weightage 2025 |
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